package arrays;
// : arrays\nArrayOptions.java

import static net.mindview.util.Print.print;

// Initialization & re-assignment of arrays.
import java.util.Arrays;

public class ArrayOptions {
    public static void main(String[] args) {
        // Arrays of objects:
        BerylliumSphere[] a; // Local uninitialized variable
        BerylliumSphere[] b = new BerylliumSphere[5];
        // The references inside the array are
        // automatically initialized to null:
        print("b: " + Arrays.toString(b));
        BerylliumSphere[] c = new BerylliumSphere[4];
        for (int i = 0; i < c.length; i++)
            if (c[i] == null) // Can test for null reference
                c[i] = new BerylliumSphere();
        // Aggregate initialization:
        BerylliumSphere[] d = {new BerylliumSphere(), new BerylliumSphere(), new BerylliumSphere()};
        // Dynamic aggregate initialization:
        a = new BerylliumSphere[] {new BerylliumSphere(), new BerylliumSphere(),};
        // (Trailing comma is optional in both cases)
        print("a.length = " + a.length);
        print("b.length = " + b.length);
        print("c.length = " + c.length);
        print("d.length = " + d.length);
        a = d;
        print("a.length = " + a.length);

        // Arrays of primitives:
        int[] e; // Null reference
        int[] f = new int[5];
        // The primitives inside the array are
        // automatically initialized to zero:
        print("f: " + Arrays.toString(f));
        int[] g = new int[4];
        for (int i = 0; i < g.length; i++)
            g[i] = i * i;
        int[] h = {11, 47, 93};
        // Compile error: variable e not initialized:
        // !print("e.length = " + e.length);
        print("f.length = " + f.length);
        print("g.length = " + g.length);
        print("h.length = " + h.length);
        e = h;
        print("e.length = " + e.length);
        e = new int[] {1, 2};
        print("e.length = " + e.length);
    }
} /*
   * Output:
   * b: [null, null, null, null, null]
   * a.length = 2
   * b.length = 5
   * c.length = 4
   * d.length = 3
   * a.length = 3
   * f: [0, 0, 0, 0, 0]
   * f.length = 5
   * g.length = 4
   * h.length = 3
   * e.length = 3
   * e.length = 2
   */// :~
